This will pull down Formula/brewer.rb from the repository, and update the tag
and revision lines with v1.0.0 and beea04da6f030de641408ca265e31fb01e7dc22f.
With the commit message Update Formula/brewer.rb to v1.0.0, by Tom Bell.

Fairly simple! In the future I might expand this to be able to update more
formula options. Potentially even specify a template to render for the formula
with the given options.